Instantaneous safety-switch



Patented Aug. 10, 1920.

Z SHEETS-SHEET l.

INVENTR M? Wely, /f l/ecz @MCM A TTORNE Y M. BUKOVECZ. xNsTANTANEous SAFETY swncH.

' l APPLICATION FILED IAN. 25, 1919.A 1,349,184.

WMV/7%@ M BUK'OVECZ.

INSTANTANEOUS SAFETY SWITCH. APPLICATION FILED 1AN.25.1919.

1,349, 184, Patented Aug. 10, 1920.

lNVEN'roR ATTORNEY UNITED PATENT OFFICE- MIGUEL ZBUKOVECZ,A 0F rMEXICO,` MEXICO.

INSTANTANEUS SAFETY-SWITCH.

Specification of Letters Patent. Patented Allg. 10,V 1920.

Application filed January 25, 1919. Serial No. 273,056.

To all whomz't may concern:

Be it known that I, Limoni. 'BUKovEoz,

of Jugo-Slav nationality, residing at Mexavoid all danger of accidentsV by touching' the fuses or exterior parts of the switch, as well as any tampering whereby fraud could be committed without leaving visible signs. The fuses are made of a simple but new construction, and access to them is only 'possible when the switch is thrown'to the opposite extreme position, in which it leaves no current to the accessible fuses. The invention also enables connection to either one of the two motors, the lines of which join in the switch, but receive current one at a time, selectively. l f Another object isto provide means for reversing the current through the lines connected to a motor, with thev object of revolving'it in the opposite direction.

Figure 1 is a perspective view of a double pole instantaneous switch, with fuses.` f y Fig. 2 is an enlarged perspective view of the same, parts being broken away to show the inside. A Fig. 3 is a perspective view of the casing inclosing a reversiblel switch with adjustable bar. i

Fig. 4 is a perspective view of one of the contact bridge pieces. l

Fig. 5 is a plan view of the said contact bridge pieces assembled, forming the contact carriage.

Fig. 6 is a perspective view of a three pole reversible switch with locking ydevice for interchanging two motors.

Fig. 7 is a plan view of the construction shown in Fig. V6. l

Fig. 8 is a plan view of the insulating late for the reversible switch shown in ig. 9 is a cross section of the contact screw and fuses.

Fig.` 10 is a Vcross section of a contact knife as used Yin all the switches. e

Referring to Figs. 1- and 2, which shoW a safety switch for a common two pole conf nection, (1) is a wooden board to which the casing (2) is fastened by means of angiev brackets (3) and wing screws (4), which should of course be properly sealed to the board. lThe upper side edges (5) of the casing are folded over so as to guide the sliding cover (6), towhich the insulating pieces (7) are attached, between which the contact bridge pieces (8) are fitted and held thereby in positioni (Fig. 5). These bridge pieces have insulating strips (9) f attached'to the middle portion thereof, and both ends, marked (10), are bent outwardly so as to facilitatethe insertion of a contact knife between Vtwo oppositely disposed bridge pieces. Springs (11) are inserted between the insulating pieces (7) and the l bridge pieces (8), so as to force them together andmake a good contact with they knives (12) and (13), projectinr from the insulating :base the board (1) by the feet (15). The contact knives are electrically connected to the contact screws (16), on which the wires (17) are fastened, as usual, by the nut and washer(18) and (19). f

The insulating base (14) has a partition y (20) of insulating material whichwill avoid tampering. The current passes through-the Contact plate`(21) `from the knives (12) to ythe contact screws (22), and then over the lfuses (23) to the Contact screws: (24), to

which the wires (25) are fastened. Y As will be seen in Fig. 9, the fuses are clamped between upper and lower contact jaw pieces (26) and (27), forced together by the nuts (28) against the vspiral springs (29), sur rounding the contact screws (24) which pierces the base`(11). The wires (25) arev retained between'washers (30) and (3l) by the nut (32).

A hinged lid (33) gives access to the fuses,

but only when the slidable cover (6) has beenfcarried to the position shown in Fig. 2, 1n which position no current can Vpass from the wires (17). In Fig. 1, the slidable cover (6) is slid to the contact position, and the switch handle V(3&1), the legs (35) of which turn in the brackets (3)1 has been thrown over the hinged lid (33) so that the spiral spring (36) has pulled the cover (6) partly over the lid, whereby it prevents the lid from being opened.

understood after the foregoing'description,

(14), which is raised from L yThe function of this apparatus is easily screws (38), and the cross wires (39) connecting the end contact screws (40) and (41), while the wires (42), which are also connected to the contact screws V(4i), lead to a motor adapted for reversed current. All these contact screws (3S), (40) and (41) are electrically connected to their corresponding contact knives, shown in dotted lines in Fig. 8, projecting on the opposite side ot the insulating base ,the bottoni of which is shown' in Fig. S, and being contained in the casing (44), (Fig. 3).

The slidable cover (45) of this switch is operated by the lever (4G) which extends across the top oi the casing (44) and moves v over the in-turned upper edges (44) thereof. The lever is thrown to one of the extreme positions, one of which is shown in dotted lines, as Well as the intermediate position. lVhen the lever (46) is brought to the intermediate position, in which it falls into a notch (442) formed centrally of one of said edges or flanges (441), no current can pass because the bridge pieces, as shown in Fig. 5 do not connect any set of contact knives, and 'furthermore the insulating' strips (9) of the-bridge pieces (8) embrace the contact knives electrically connected. to the contact screws Now, supposing that the lever (46) `were brought to the ei;- treme position at the right-oi? Fig. 8, then the contact bridge pieces would, connect the contact knives corresponding to the contact. screws and (40), and in the same manner, if the lever 4G) were brought'to the lett, then thc contact bridge pieces would connect the contact knives corresponding to the contact screws (38) and (41), whereby the current would be reversed, due to the disposition of the cross wires (39).

In Figs. G and 7, I have shown hcw the inventionvis applied to a three pole selecting switch. The casing (47) is provided with two hinged lids (48) and (49), and an intermediate slidable cover (50), which will always obstruct the opening of either of the lids. The handle (5l) is ulcrumed in the varched supports (52), fixed to the sides of the casing (47) while the coil springs (53) will produce tension between the handle and the cover. Three pairs of Contact Vbridge pieces (S) and their coperating elements, like those illustrated in Figs. 4 and 5, are attached to the inside of the cover, in order to move therewith to any of the three positions, either of the two extreme positions or to the middle position, which is the neutral position, while the extreme positions will allow the current to flow irom the inter-V mediate contact knives (54) to the contact knives (55), at the right oit Fig. 6, or to the contact knives (56) disposed at the le'l't, or opposite end ort the switch, ln order to make the switch instantaneous in its operation, a latch bar (57) provided with bent ends (5S) slides in the supports (59), i'astened on top ot the slidable cover (50), and also slides in the sleeve (60) fixed to said cover. A projecting pin (6l) on the latch bar is adapted to enter into either ot the two notches (62) oit said sleeve In Fig. G, the switch lies at the right-hand end between the wires and the three wires (64); and should it be desired to reverse the switch so as to give current to the wires (65) on the opposite end and leading to another motor, then the bar is turned upward through a quarter revolution so as to disengage pin (6l) from the left-hand notch (62) and at the same time to aline its bent right-hand end with the cross-groove (6G) ina stop block (67) on the right-hand cover (49). Thereafter, the bar is turned back to its former position, engaging pin (6l) in the right-hand notch and catching its right-hand end in stops (67), whereby the bar is retained in position. After this operation, the handle (51) may now be swung over toward the wires (65), thereby giving tension to the springs (53), and by disengagingthe projecting'pin (6l) from the notch (62) and the bar end from the stop (67), the latch bar is released like a trigger, and springs to the left, moving the cover (50) in the same direction until its left-hand bent end strikes against the left-hand stop (68) which is mounted on the left-hand lid (48).

By this action the contaetbridge pieces will have established connection between the contact knives (54) and (56), leading to the wires The fuses (69), like those described in Fig. 2, are separated by the insulating partition (70), and may be furthermore protected against sparks -from high tension current, by means oif'transverse insulating partitions between each fuse, which is self-explaining.

Having thus described my invention what I claim is:

1. An instantaneous safety switch comprising a casing, an insulating base in said casing provided with two sets of stationary contact knives, one set connected to the main line and the other through fuses to the power receiving device, a hinged lid covering said fuses, an insulating cover adapted to slide over said lid, sets of contact bridge pieces attached to the inside of said cover adapted to connect said sets of Contact knives when the cover is slid over said lid, said bridge pieces being covered with insulating material at their intermediate portion opposite to the Contact knives, and spring means connected with the cover and adapted to be put under tension so as to automatically shift said cover alternatively in one direction or the other to make or break contact between the knives and the bridge pieces.

2. An instantaneous reversible safety switch, comprising a casing, an insulating move therewith so as to bridge either of the i end sets of knives with the intermediate set of knives.

3. An instantaneous selective safety switch comprising a casing, an insulating base therein having three projecting sets of alined Contact knives, the intermediate set of knives being connected to the leading in wires, and the end sets of contact knives leading out to two power receiving devices,- fuses betweenV said' eXtreme sets of knives and contained in said casing, a hinged lid over said fuses, a cover on top of said casing slidable to position to permit only one of said lids to be opened at a time, bridge pieces on the inside of said cover adapted to connect either of the end sets oi knives with the intermediate set, and a spring' trigger mechanism for carrying said cover toward either of said end sets of knives.

yIn testimony whereof I have aii'ixedmy signature.

MIGUEL BUKOVECZ. 

